Textiles: spinning – twisting – and twining – Strand structure – Covered or wrapped
Patent
1988-04-04
1990-11-06
Lesmes, George F.
Textiles: spinning, twisting, and twining
Strand structure
Covered or wrapped
57210, 57229, 428364, 428372, 428379, 428392, 428395, D02G 302, D02G 312, D02G 318, D02G 338
Patent
active
049675486
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a fire-resistant textile yarn, comprising an inorganic filament core surrounded by fibres formed at least in part from aramid resin, and relates further to use of this yarn.
It has already been proposed to use these aramid fibres to produce yarn for making a fire-resistant material. The said aramid fibres are similar in appearance to polyamide 6--6 fibres and are resistant to bending and equivalent abrasion. However, while polyamide 6--6 melts at 250.degree. C., aramid fibres at this temperature have a resistance to rupture equivalent to 60% of their resistance at room temperature. Aramid fibres do not melt, but begin to deteriorate above 370.degree. C.
U.S. Pat. No. 4,381,639 discloses a yarn of the type comprising a core, formed from a continuous filament comprising at least 96% SiO.sub.2, surrounded by aramid fibres, the mass ratio of fibres/core being 40:60 with a core 0.5 mm in diameter. Yarn of this type is unsuitable for making clothing fabric, but can only be used for producing protective fabric for items of safety clothing which are only to be worn for performing special tasks, for a limited period. The mass ratio of aramid fibres and the core is too low to ensure proper covering of the core. As the aramid fibres are pigmented and the filament of the core is not, this core will appear in the fabric. Although poor covering of the core is acceptable for safety clothing for professional use only, this is not the case when the fabric is intended for clothing which, in addition to its fire-resistant properties, is also to comprise an item of clothing, the appearance and comfort of which should be comparable to those of ordinary fabric. This is especially the case with fabrics used in making uniforms.
It is obvious that if, in the case of the type of yarn disclosed in the aforementioned document, it were desirable to increase substantially the mass ratio of aramid fibres relative to that of the core, the yarn count would at the same time be increased and would therefore become too high for making clothing fabric.
The thickness of the filament used to form the core of the yarn is in particular imposed by the twisting which this filament undergoes during the operation to spin the aramid fibres around the core, twisting which a substantially finer filament would not tolerate or which would excessively weaken it.
It has likewise been proposed in U.S. Pat. No. 4,384,449 to manufacture a yarn with a core made from an inorganic substance around which two aramid filaments or yarns formed from aramid fibres are wound along two counter-directional helixes. Where the core is surrounded by aramid fibres the yarns are spun beforehand, so that the resulting yarn is a type of twister yarn formed about a core. The aramid fibres are therefore not spun around a frame. It is obvious that a yarn of this type can be used to produce a protective fabric, particularly for making gloves, but would not be suitable for making clothing fabric.
It will be seen that the heat-resistant yarns proposed by the prior art can be used to manufacture protective fabrics, but would not be used to make fabrics suitable for clothing. Fabrics of this type should have, in addition to their properties for protecting against heat and fire, the appearance of any other clothing fabric and adequate mechanical resistance to stress and rupture. This fabric must obviously be permeable to air and vapour to allow physiological exchanges to occur, and its surface unit weight should not be too great, but should be comparable to that of normal clothing fabric.
The aim of the present invention is to propose a solution combining these different requirements.
To this end, the subject of the invention is a heat-resistant textile yarn comprising an inorganic filament core surrounded by fibres formed at least in part from aramid resin, characterised in that the yarn count is between 30-50 tex, the mass ratio of the core being between 10% and 25%, the aramid fibres being spun around this core without axial twisting. The subject of th
REFERENCES:
patent: 4331729 (1982-05-01), Weber
patent: 4384449 (1983-05-01), Byrnes, Sr.
patent: 4500593 (1985-02-01), Weber
The Modern Textile Dictionary, George E. Linton, Ph. D. Duell, Sloan & Pearce, p. 1068.
"High-Tech Yarns" pamphlet of Fehrer AG Engineered Yarns with DREF-Friction Spinning Technology.
Choserot Alain
Christ Pierre
Fangeat Roland
Filature de la Gosse S.A.
Gray Jill M.
Lesmes George F.
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